LESS Mixins eliminate the need of writing repeatable CSS by allowing you to re-use portions of code within your project. The basic principals of mixins is that you define some CSS properties within the mixin declaration, and then call the mixin in the CSS classes that you want to use the properties for.

The most common CSS property that could require a mixin is border-radius. The original CSS for this includes the properties for the different CSS rendering engines of different browsers (-webkit, -moz). Therefore we might have a rule that looks like the following: